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package com.hardcode.gdbms.engine.data.db;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import com.hardcode.driverManager.Driver;

import com.hardcode.driverManager.DriverLoadException;

import com.hardcode.gdbms.driver.exceptions.OpenDriverException;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

import com.hardcode.gdbms.driver.exceptions.ReloadDriverException;

import com.hardcode.gdbms.engine.data.AbstractDataSource;

import com.hardcode.gdbms.engine.data.SourceInfo;

import com.hardcode.gdbms.engine.data.driver.AlphanumericDBDriver;

import com.hardcode.gdbms.engine.data.driver.DBDriver;

import com.hardcode.gdbms.engine.data.driver.DriverException;

import com.hardcode.gdbms.engine.data.driver.GDBMSDriver;

import com.hardcode.gdbms.engine.data.edition.DataWare;

import com.hardcode.gdbms.engine.values.Value;

/**

 * Adaptador de la interfaz DBDriver a la interfaz DataSource. Adapta las

 * interfaces de los drivers de base de datos a la interfaz DataSource.

 *

 * @author Fernando Gonz?lez Cort?s

 */

public class DBDataSourceAdapter extends AbstractDataSource

    implements DBDataSource {

    /*

     * datos de la conexi?n

     */

    protected String host;

    protected int port;

    protected String dbName;

    protected String user;

    protected String password;

    //driver de base de datos

    protected DBDriver driver;

    //objetos jdbc

    protected Connection con;

    //Instrucci?n sql completa que representa el dataSource

    protected String sql;

    /**

     * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getRowCount()

     */

    public long getRowCount() throws ReadDriverException {

        return ((DBDriver)getDriver()).getRowCount();

    }

    /**

     * Establece el driver

     *

     * @param driver The driver to set.

     */

    public void setDriver(DBDriver driver) {

        this.driver = driver;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getFieldCount()

     */

    public int getFieldCount() throws ReadDriverException {

        return ((DBDriver)getDriver()).getFieldCount();

    }

    /**

     * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getFieldName(int)

     */

    public String getFieldName(int fieldId) throws ReadDriverException {

        return ((DBDriver)getDriver()).getFieldName(fieldId);

    }

    /**

     * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getFieldType(int)

     */

    public int getFieldType(int i) throws ReadDriverException {

        return ((DBDriver)getDriver()).getFieldType(i);

    }

    /**

     * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getFieldValue(long,

     *      int)

     */

    public Value getFieldValue(long rowIndex, int fieldId)

        throws ReadDriverException {

        return ((DBDriver)getDriver()).getFieldValue(rowIndex, fieldId);

    }

    /**

     * DOCUMENT ME!

     *

     * @return

     */

    public Driver getDriver() {

        return driver;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#setSourceInfo(com.hardcode.gdbms.engine.data.driver.DriverInfo)

     */

    public void setSourceInfo(SourceInfo sourceInfo) {

        super.setSourceInfo(sourceInfo);

        this.host = ((DBSourceInfo) sourceInfo).host;

        this.port = ((DBSourceInfo) sourceInfo).port;

        this.dbName = ((DBSourceInfo) sourceInfo).dbName;

        this.user = ((DBSourceInfo) sourceInfo).user;

        this.password = ((DBSourceInfo) sourceInfo).password;

        this.tableName = ((DBTableSourceInfo) sourceInfo).tableName;

        this.con =((DBTableSourceInfo) sourceInfo).connection;

        this.sql = "SELECT * FROM " + tableName;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.db.DBDataSource#execute(java.lang.String)

     */

    public void execute(String sql) throws ReadDriverException {

        try {

                ((DBDriver)getDriver()).execute(this.getConnection(), sql);

        } catch (SQLException e) {

            throw new ReadDriverException(getName(),e);

        }

    }

    protected String tableName;

    protected int sem = 0;

    private int[] cachedPKIndices = null;

    /**

     * Get's a connection to the driver

     *

     * @return Connection

     *

     * @throws SQLException if the connection cannot be established

     */

    public Connection getConnection() throws SQLException {

            if (this.con == null) {

                    return driver.getConnection(host, port, dbName, user, password);

            }

            else {

                    return this.con;

            }

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#start()

     */

    public void start() throws ReadDriverException {

        try {

            if (sem == 0) {

                    con = getConnection();

                    ((AlphanumericDBDriver) driver).open(con, sql);

                    // driver.setSourceInfo(this.getSourceInfo());

            }

            sem++;

        } catch (SQLException e) {

            throw new ReadDriverException(getName(),e);

        }

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#stop()

     */

    public void stop() throws ReadDriverException {

        try {

            sem--;

            if (sem == 0) {

                    driver.close();

                    if (this.con == null) {

                        con.close();

                        con = null;

                    }

            } else if (sem < 0) {

                throw new RuntimeException("DataSource closed too many times");

            }

        } catch (SQLException e) {

            throw new ReadDriverException(getName(),e);

        }

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#getDBMS()

     */

    public String getDBMS() {

        return ((DBSourceInfo)sourceInfo).dbms;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#getName()

     */

    public String getName() {

        return sourceInfo.name;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#getPrimaryKeys()

     */

    public int[] getPrimaryKeys() throws ReadDriverException {

        if (cachedPKIndices == null) {

            try {

                //Gets the pk column names

                Connection c = getConnection();

                ResultSet rs = c.getMetaData().getPrimaryKeys(null, null,

                        driver.getInternalTableName(tableName));

                ArrayList pks = new ArrayList();

                while (rs.next()) {

                    pks.add(rs.getString("COLUMN_NAME"));

                }

                //create the index array

                cachedPKIndices = new int[pks.size()];

                for (int i = 0; i < cachedPKIndices.length; i++) {

                    cachedPKIndices[i] = getFieldIndexByName((String) pks.get(i));

                }

            } catch (SQLException e) {

                throw new ReadDriverException(getName(),e);

            }

        }

        return cachedPKIndices;

    }

    /**

     * @see com.hardcode.gdbms.engine.data.DataSource#getDataWare(int)

     */

    public DataWare getDataWare(int mode) throws ReadDriverException {

                try {

                        DBDataWare dw = DBDataSourceFactory.newDataWareInstance(((DBDriver)getDriver()), mode);

                        DBDriver driver;

                        driver = (DBDriver) getDataSourceFactory().getDriverManager().getDriver(getDriver().getName());

                ((GDBMSDriver) driver).setDataSourceFactory(getDataSourceFactory());

                dw.setDriver(driver);

                dw.setDataSourceFactory(dsf);

                dw.setSourceInfo(getSourceInfo());

                return dw;

                } catch (DriverLoadException e) {

                        throw new ReadDriverException(getName(),e);

                }

    }

        public int getFieldWidth(int i) throws ReadDriverException {

        return ((DBDriver)getDriver()).getFieldWidth(i);

        }

        public void reload() throws ReloadDriverException {

        try {

            sem = 0;

            driver.close();

            if (this.con == null) {

                    con.close();

                    con = null;

            }

            this.start();

        } catch (SQLException e) {

            throw new ReloadDriverException(getName(),e);

        } catch (ReadDriverException e) {

                 throw new ReloadDriverException(getName(),e);

                }

        this.raiseEventReloaded();

        }

}